Method and apparatus for making bags



W. E. SHARKEY METHOD AND APPARATUS FOR MAKING BAGS Jan. 7, 1936.

Filed March 16, 1935 2 Sheets-Sheet l his 4 TTUW/EX I Jan. 7, 1936.

w. E. SHARKEY METHOD AND APPARATUS FOR MAKING BAGS Filed March 16, 1935 2 Sheets-Sheet 2 Patented Jan. 7, 1936 PATENT OFFICE 2,027,205 METHOD AND APPARATUS FOR MAKING BAGS William E. Sharkey, Middletown, Ohio, assignor to The Raymondv Bag Company, Middletown,

Ohio, a corporation of Ohio Application March 16, 1935, Serial No. 11,398

14 Claims.

This invention relates to a method and apparatus for making bags and is designed more partlcularly for use in the manufacture of a multiplewall bag of the type shown in the Woodward Patent No. 1,929,229, of October 3,1933. The multiwall bag of that patent has a pasted end closure in which theintermediate plies of the side flaps are serrated, arranged in staggered relation and pasted to the outer plies, which have continuous edges. In the manufacture of such a bag means must be provided for serrating the ends of the intermediate plies of the successive bag sections without cutting or otherwise deforming the outer plies.

One object of the present invention is to provide a method for providing the intermediate ply or plies of a multi-wall bag at one or both ends with serrations or tongues which lie between the end portions of the outer plies; and to pro;-

vide a suitable mechanism for carrying out the method.

A further object of the invention is to provide such a mechanism which will be simple in construction and operation and which may be applied to an existing machine without substantial changes in construction of the latter.

A further object of the invention is to provide means for forming the serrations by forming openings in the intermediate web before the webs are folded into tube form and so arranging the openings that the line of severance, of the bag section, will intersect the series of openings.

A further object of the invention is to provide such a machine with means for removing the cutout portions or chips which are severed from the web.

Other objects of the invention willappear as the mechanism is described in detail.

In the accompanying drawings Fig. 1 is a longitudinal sectional view of a mechanism embodying my invention, showing the same applied to a bag making machine; Fig. 2 is a section taken on the line 22 of Fig. 1, looking in the direction of the arrows; Fig. 3 is a perspective view of one end of the multi-wall bag having the intermediate plies thereof serrated; Fig. 4 is a diagrammatic view showing the relation of the intermediate plies one to the other and to the' outer plies, with the plies in their fiat or extended positions and with the upper plies displaced longitudinally with relation to the lower ply; Fig. 5 is a plan view of a portion of the intermediate web showing the transverse series of openings therein; Fig. 6 is a plan view of one of the cutting elements for (01. ss-ss) plied to machines of various kinds. In thisma- 10 chine a plurality of webs, of bag material, in the present instance four, are drawn into the machine in superposed relation from rolls, one of which is shown at Ill. These webs are. carried about a guide I [to a paste applying device, which may consist of a roller, or rollers 12, mounted in a paste receptacle l3 and arranged to engage the webs as they pass about a guide roller H. The webs are laterally offset one from the other, as shown in Fig. 4, so as to expose an edge portion of each web which may be contacted by the paste applying device. After paste has been applied to the edges of the webs they are carried through a folding device, shown diagrammatically at l5, which folds the same into tubular form with the pasted edge of each tube overlapping the other edge of that type. The tubes are arranged one within the other,'or nested, and they pass from the folding device between feed rollers I6 which draw the webs from the rolls I0 and deliver the nested tubes to a severing device which divides the same into bag length sections, a portion 01."

same length but the inner plies are serrated, or

provided with tongues, and in order to form these serrations I have provided means arranged to act on the webs in advance of the folding operation, that is, while the webs are in their flat conditions. The particular arrangement here illustrated is designed for use in the production of 'a four wall bag and therefore is constructed to handle four webs of paper. It will be obvious, however, that by duplication or elimination of parts of the mechanism the latter could be made to handle any desired number of webs. The webs are carried about a plurality of sets of guides, l8, l9 and 20, which are arranged to support the webs in separated positions one above the other. After the webs pass the guides they are carried about the guide II and there brought into contact one with the other and passed to the pasting mechanism. The two intermediate webs, 2| and 22, are acted upon by cutting mechanism whi h forms successive transverse series of openings 40 in each web as the latter advance through the machine. For this purpose I have arranged a rotary cutting element 23 above the separated portion of each of the webs 2| and 22 and a cooperating cutting element or platen 24 beneath each'of said webs. These cutting elements are rotated at the same speed and cooperate to form openings in the respective webs. The upper cutting element preferably comprises a hollow shaft 25 and tubular blades 26 having a continuous edge so as to completely remove a portion of the web. There may be any suitable number of blades and these may be of any desired shape and may be spaced apart any suitable distance so that the spaces between the openings will be of the desired size and shape. The several blades are here arranged in groups which are spaced apart a substantial distance to provide for the edge walls of the bags, which are not serrated.

The cutting elements are so arranged with relation to the tube severing device that the line on which the tubes are severed will intersect each series of openings. In the present instance the line of severance is midway between the front and rear ends of the openings so that each portion of the web, or tube, is provided with serrations or tongues 4|. When one end only of the bag is to be provided with serrated flaps the line of severance will intersect the openings close to or coincident with the end wall of the opening, and the openings will be of such a character as to provide tongues of proper shape.

As has been stated, the outer plies of the closure flaps have straight continuous edges and are pasted to the tongues or serrations of the intermediate flaps. The tongues or serration on one intermediate ply are arranged in staggered relation to the tongues or serrations on the other ply, as shown in Figs. 3 and 4, thus enabling both outer flaps to be pasted to both inner flaps. For

this purpose I have provided means for applying successive transverse lines of paste to the inner surfaces of both outer webs in such positions that when the webs are brought into contact one with the other these lines of paste will register with or overlie the transverse series of openings in the intermediate flaps and the outer webs will thus be pasted to those portions of the intermediate webs lying between the openings, which portions subsequently form the tongues. As here shown, a rotary paste applying device 21 is mounted on a shaft 28 adjacent to the guide rollers 20 for the respective outer webs, which are indicated at 29 and 30. The paste applying device receives its paste from a roller 3| mounted in a paste receptacle 32 and delivers this paste to the web as the latter passes over the roller 20, the paste applying device preferably contacting with the web slightly in advance of the contact of the web with the roller 20. The line of paste may be of any suitable width and, if desired, the paste applying device may have two separated contact surfaces, as shown at 33, so that the line of paste is divided into two parts. When the webs have been brought together and the paste lines overlie the openings the line of severance will extend centrally through the line of paste, so that the tongues on both sides of the line of severance will be pasted to the outer webs. Preferably the paste applying devices are divided into sections, as shown in Fig. 2, conforming to the groups of cutter blades, so as to avoid applying the paste to the edge walls of the bag sections, where it is unnecessary and undesirable.

The cutting elements 23 and 24 and the paste applying devices 21 are driven in properly timed relation through interconnecting gears 34 and 35 which are in turn driven from a moving part of the machine. As here shown, the gear 35 is con- 5 nected with a worm wheel 36 which meshes with a worm 31 on a shaft 38 which is connected at its forward end with the driving shaft for the tube severing device, which driving mechanism is not here shown. 10

It is, of course, necessary that some means be provided for withdrawing the cuttings or chips which are removed from the webs and, as above stated, each cutting element preferably comprises a tubular blade and a hollow shaft and the two 5 cutter shafts are connected with a suction conduit 39 which leads to suitable suction apparatus, not shown, and this suction serves to draw the chips through the blades and hollow shaft.

While I have shown and described my preferred 20 method and one form of apparatus for performing the method I wish it to be understood that I do not desire to be limited to the details of either as various modifications may occur to a person skilled in the art. 5

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A method of providing the intermediate plies of a multi-Wall bag with serrated ends comprising 30 feeding a plurality of superposed webs at uniform speed, separating said Webs, forming in each intermediate web a plurality of series of openings, the adjacent series of openings in each web being spaced apart a distance approximately equal to 35 the length of a. bag section, applying paste to the inner surfaces of the two outer webs along transverse lines arranged to register with the transverse series of openings in the intermediate web, bringing said webs into contact one with the other, 40 folding said webs longitudinally to form nested tubes, pasting the longitudinal edges of each tube one to the other, and severing said nested tubes into bag sections along transverse lines intersecting the respective series of openings in said inter- 45 mediate webs.

2. A method of providing the intermediate plies of a multiwall bag with serrated ends comprising feeding a plurality of superposed webs at uniform speed, separating said webs, forming in each in- 50 termediate web a plurality of series of openings, the adjacent series of openings in each web being spaced apart a distance approximately equal to the length of a bag section, bringing said webs into contact one with the other, folding said webs longitudinally to form nested tubes, pasting the longitudinal edges of each tube one to the other, and severing said nested tubes into bag sections along the transverse lines intersecting the respective series of openings in the respective webs between the front and rear ends of said opening to provide each end of each bag section with serrations.

3. A method of providing the intermediate plies 05 of a multi-wall bag with serrated ends comprising feeding a plurality of superposed webs at uniform speed, separating said webs, forming in each intermediate web a plurality of transverse series of openings, the openings of each series extending forwardly and rearwardiy from a transverse line intersecting the same, .said transverse lines of each web beingspaced apart a distance equal to the length of a bag section, applying paste to the inner surfaces of the two outer webs on opposite 7 sides of transverse lines arranged to register with the respective lines which intersect the openings in said intermediate webs, bringing said webs into contact one with the other, folding said webs longitudinally to form nested'tubes, pasting the iongitudinal edges of each tube one to the other, and severing the nested tubes along said transverse lines to form bag sections.

4. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for folding section will be provided at both ends with tongues.

5. In a bag making machine comprising means g for. simultaneously feeding a plurality of superposed webs of bag material, means for folding said webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and means for severing successive portions of said nested tubes along a transverse line to form bag sections; means in advance of said folding means to form in an intermediate web successive series of openings, the openings of each series intersecting a transverse line which constitutesthe line of severance when it arrives.

at said severing means, and means for applying paste to the inner surface of an outer web along transverse'lines arranged to register with the respective seriesof openings in said intermediate web at the time of severance.

6. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for folding ,said webs longitudinally to form nested tubes and for pasting the longitudinal edges of eachtube one to the other, and means for severing successive portions of said nested tubes along a transverse line to form bag sections: means in advance of said folding means to form in an intermediate web successive series of openings, the openings of each series intersecting a transverse line which constitutes the line of severance when it arrives at said severing means, said openings extending forwardly and rearwardly from said line of severance, and means for applying paste to the inner surface of an outer web on opposite sides of a transverse line arranged to register with said line of severance.

7. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for foldingsaid webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and means for severing successive portions of said nested tubes along a transverse line to form bag sections; means for spacing said webs one from the other during a portion of their travel, cutting elements arranged on ,opposite sides of an intermediate web and cooperating to form therein a transverse series of openings, said cutting elements being so arranged with relation ,to said tube. severing means that the line of severance will intersect said openings. I 8. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for folding said webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and means for severing 5 successive portions of said nested tubes along a transverse line to form bag sections; web guiding means arranged to support said webs in separated positions during a portion of their travel and to then bring them into contact one with the other, a cutting device arranged to act on the separated portion of an intermediate web to form therein a transverse series of openings,

a paste applying device arranged on the inner side of an outer web to apply a transverse line of paste to said outer web in such a position that said line of paste will register with said transverse series of openings when said webs are brought into contact, said cutting device being so arranged with relation to said tube severing means that the line of severance will intersect said openings.

9. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for folding said webs longitudinally to form nested tubes and for pastingthe longitudinal edges of each tube one to the other, and means for severing successive portions of said nested tubes along a transverse line to form bag sections; web guiding means arranged to support said webs in separated positions during a portion of their travel and to then bring them into contact one with the other, cooperating cutting means arranged on the opposite sides of each intermediate web to form therein transverse series of openings at regular intervals as said webs are advanced, the openings in one web being in staggered relation to the openings in the adjacent web, a paste applying device arranged to apply a transverse line of paste to the inner surfaces of the outer webs in such positions that said lines of paste will register with said series of openings when said webs are brought into contact, said cutting elements being so arranged with relation to said 4;; tube severing means that the line of severance will intersect said openings and divide said line of paste, whereby the intermediate plies of each bag section will have at both ends thereof tongues, the tongues of each ply'being pasted to 59 both outer plies.

10. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for folding said webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and means for severing successive portions of said nested tubes along a transverse line to form bag sections; means for spacing said webs one from the other during a 60 portion of their travel, cutting elements arranged on opposite sides of an intermediate web and cooperating to form therein a transverse series of openings, said cutting elements being so arranged with relation to said tube severing means that 'the line of severance will intersect said openings, and. means for withdrawing the cut-out parts from between adjacent webs.

11*. In a bag making machine comprising means for simultaneously feeding a plurality of 7 superposed webs of bag material, means for fold-' ing said webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and means for severing successive portions of said nested tubes along a 'transverse line to form bag sections; means for spacing said webs one from the other during a portion of their travel, cutting elements arranged on opposite sides of an intermediate web and cooperating to form therein a transverse series of openings, said cutting elements being so arranged with relation to saidtub'esevering means that the line of severance will intersect said openings, and pneumatic means for withdrawing the parts which have been removed from said webs.

12. In a bag making machine comprising means for simultaneously feeding a plurality of superposed webs of bag material, means for folding said webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and means for severing successive portions of said nested tubes along a transverse line to form bag sections; means for spacing said webs one from the other during a portion of their travel, cutting elements arranged on opposite sides of an intermediate web and cooperating to form therein a transverse series of openings, said cutting elements being so arranged with relation to said tube severing means that the line of severance will intersect said openings, one 'of said cutting elements including a hollow shaft and tubular blades carried by said shaft and communicating with the interior thereof, and-means for connecting said hollow shaft with suction creating apparatus.

a 13. A method of providing an intermediate ply of a multi-wall bag with a serrated end comprising feeding a plurality of superposed webs at wise of said web a substantial distance from said transverse line, the adjacent series of openings being spaced apart a distance approximately equal to the length of a bag section, bringing said webs into contact one with another, folding said webs longitudinally to form nested tubes, pasting the longitudinal edges of each tube one to the other, and cutting said nested tubes into tube sections along said transverse line, whereby the material between the openings of each series will form tongues on at least one side of the line of cut.

14. Ina bag making machine comprising means for. simultaneously feeding a plurality of superposed webs of bag material, means for folding said webs longitudinally to form nested tubes and for pasting the longitudinal edges of each tube one to the other, and cutting means for severing successive portions of said nested tubes along a transverse line to form bag sections; means in advance of said folding means to form in an intermediate web successive transverse series of relatively large openings, the openingsof each series intersecting and extending for a substantial distance from at least one side of a transverse line which constitutes the line of severance when it arrives at'said severing means.

WILLIAM E. SHARKEY. 

